A4
n. A4型纸（规格为297×210毫米的纸）
🗣️ 情景例句
That'll be fine.
就这样说定了。
He irons sweaters every day.
他每天都烫衣服。
Suppose every sensor gives perfectly accurate readings of temperature,
再假定每个传感器都极端准确地读出了温度、